<p>Disclosed is a transfection microarray which enables the introduction of a nucleic acid into a cell and the expression of the nucleic acid only by adding the nucleic acid to a plate or the like and then seeding and culturing the cell therein without the need of addition of a transfection reagent or an additive. A transfection microarray comprising atelo-collagen, a transfecting gent and a nucleic acid in a plate or the like. A cell into which the nucleic acid is to be introduced is seeded to the microarray and then cultured to thereby introduce the nucleic acid into the cell without the need of preparation of a viral vector or a mixture of a nucleic acid with a transfecting agent or without the need of addition of a transfecting agent or an additive after the cell is cultured.</p>
